looking good!!
If I may add those little notes about the dust smoke…
- I think you should add more turbulence & lower the swirl size. If I compare it to your reference.
- It should also dissipate slower and have the feel its a heavy dust smoke.
-last note would be the integration, make sure that your darkest blacks and your whitest white matches your plate. This helps you get at least the base color grading needed to make it integrate. Your bricks fits well with the plate but if you look at your dust smoke render, I feel the shadows are strong compared to the lit area or maybe its the inverse! a good way to adjust that would be to make a 3 point lighting (R-G-B) around your some where the blue for example would match your light, Green the shadow area and Red the camera view or back light. If you split them in comp, you can color correct each area of the smoke and have better control over the final look!
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did I say it's looking good!!